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Publication Type
Conference Proceedings
Author, Analytic
Riley, C.K.; Morrison, E.Y.St.A; Wheatley, A.O.; Ahmad, A.M.; Asemota, H.N.; Hassan, I.
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Paper/Section Title
In vitro digestibility of starches from yams (dioscorea spp) grown in Jamaica: A condition for glucose availability
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Proceedings Title
Annual National Conference on Science and Technology: Science and Technology for Economic Growth and Development: Proceedings of the Seventeenth Annual National Conference on Science and Technology
Date of Meeting
November 19-22, 2003
Place of Meeting
Kingston, Jamaica
Place of Publication
Kingston, Jamaica
Publisher Name
The Scientific Research Council
Date of Publication
2003
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Abstract
Yams are important sources of carbohydrates in the diet of millions of people in the tropical and subtropical world, where 70-80% of the dry mass is starch. This study was designed to investigate the physiochemical characteristics of starches from different yam varieties and their influence on digestibility. Starches from five yam varieties grown in Jamaican were extracted. The physiochemical properties; crystallinity determined by X-ray crystallography, granular size and the amylose content were determined and their effects on starch digestibility assessed. Scanning electron microscopy, Crystallinity and amylose contents were determined by the method of Farhat et al (1990) and in vitro digestibility determined by method of Moorthy et al (1999). Statistical differences of starch variables were obtained by use of the studentís t test. X-ray diffractograms of Round leaf yellow yam (Dioscorea cayenensis), Sweet yam (Dioscorea alata), and Negro yam (Dioscorea rotundata) showed open hydrated hexagonal crystallites (type B). However, Bitter yam (Dioscorea dumentorum) had denser crystallites, with staggered monoclinic packing (type A), and Chinese yam (Dioscorea esculenta) the intermediate type crystallites (type C).....
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